Zobrazeno 1 - 10
of 364
pro vyhledávání: '"Garay,Luis"'
We compute the evolution of linear perturbations on top of a background solution of a general nonlinear electromagnetic theory. This evolution can be described in terms of two effective metrics, and we analyse under what conditions they are conformal
Externí odkaz:
http://arxiv.org/abs/2411.07898
No-hair theorems are uniqueness results constraining the form of the metric of black holes in general relativity. These theorems are typically formulated under idealized assumptions, involving a mixture of local (regularity of the horizon) and global
Externí odkaz:
http://arxiv.org/abs/2410.08128
There exist two consistent theories of self-interacting gravitons: general relativity and Weyl transverse gravity. The latter has the same classical solutions as general relativity, but different local symmetries. We argue that Weyl transverse gravit
Externí odkaz:
http://arxiv.org/abs/2409.06645
We discuss how the comment by A. Loeb [arXiv:2408.06714] has no bearing on the results of Phys. Rev. Lett. 133, 041401 (2024) [arXiv:2405.02389].
Comment: 2 pages. RevTeX 4.2
Comment: 2 pages. RevTeX 4.2
Externí odkaz:
http://arxiv.org/abs/2408.11097
Publikováno v:
Physical Review Letters 133, 041401 (2024)
We show that it is not possible to concentrate enough light to precipitate the formation of an event horizon. We argue that the dissipative quantum effects coming from the self-interaction of light (such as vacuum polarization) are enough to prevent
Externí odkaz:
http://arxiv.org/abs/2405.02389
Publikováno v:
Phys. Rev. D 109 (2024) 126011
We study the notion of volume and its dynamics in the loop-quantum-gravity truncation known as the two-vertex model. We also show that its U(N)-symmetry reduction provides the old effective dynamics of loop quantum cosmology with an arbitrary perfect
Externí odkaz:
http://arxiv.org/abs/2403.15320
Publikováno v:
J. High Energ. Phys. 2024, 1 (2024)
We analyze how the presence of closed timelike curves (CTCs) characterizing a time machine can be discerned by placing a local particle detector in a region of spacetime which is causally disconnected from the CTCs. Our study shows that not only can
Externí odkaz:
http://arxiv.org/abs/2402.17825
We study the scalar modes that, being observable today, were trans-Planckian before inflation, within the context of hybrid Loop Quantum Cosmology (LQC). We analyse the dynamics of these highly ultraviolet modes by introducing modified dispersion rel
Externí odkaz:
http://arxiv.org/abs/2402.08375
The backreaction of quantum fields in their vacuum state results in equilibrium structures that surpass the Buchdahl compactness limit. Such backreaction is encapsulated in the vacuum expectation value of the renormalized stress-energy tensor (RSET).
Externí odkaz:
http://arxiv.org/abs/2310.12668
Gravitational particle production of spectator fields due to the expansion universe during the inflationary and reheating phases of the early universe is of particular interest in the context of dark matter, since it allows to constrain the propertie
Externí odkaz:
http://arxiv.org/abs/2310.07515